user
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Provide a evidence explaining why the following code is incorrect.

### Input:
def add(a, b):
    return a + b

### Response:
assistant
The code above is incorrect because it does not handle cases when any one or both of the arguments are of type 'list'. It would throw a TypeError since the '+' operator cannot be used to concatenate lists. To make it work with any type of arguments, the code should be modified as follows:

def add(a, b):
    if type(a) is list and type(b) is list:
        return a + b
    else:
        return int(a) + int(b)